> +static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
> +{
> + struct rtnl_link_ops *ops;
> + struct net_device *dev;
> + struct ifinfomsg *ifm;
> + char name[MODULE_NAME_LEN];
> + char ifname[IFNAMSIZ];
> + struct nlattr *tb[IFLA_MAX+1];
> + struct nlattr *linkinfo[IFLA_INFO_MAX+1];
> + int err;
> +
> + err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
> + if (err < 0)
> + return err;
> +
> + if (tb[IFLA_IFNAME])
> + nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
> + else
> + ifname[0] = '\0';
> +
> + ifm = nlmsg_data(nlh);
> + if (ifm->ifi_index > 0)
> + dev = __dev_get_by_index(ifm->ifi_index);
> + else if (ifname[0])
> + dev = __dev_get_by_name(ifname);
> + else
> + dev = NULL;
> +
> + if (tb[IFLA_LINKINFO]) {
> + err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
> + tb[IFLA_LINKINFO], ifla_info_policy);
> + if (err < 0)
> + return err;
> + } else
> + memset(linkinfo, 0, sizeof(linkinfo));
> +
> + if (linkinfo[IFLA_INFO_NAME]) {
> + nla_strlcpy(name, linkinfo[IFLA_INFO_NAME], sizeof(name));
> + ops = rtnl_link_ops_get(name);
Ugh. Shouldn't we have the request_module logic here?
Otherwise it looks like we can skip the validate method and
have other weird interactions.
> + } else {
> + name[0] = '\0';
> + ops = NULL;
> + }
> +
> + if (1) {
> + struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
> +
> + if (ops) {
> + if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
> + err = nla_parse_nested(attr, ops->maxtype,
> + linkinfo[IFLA_INFO_DATA],
> + ops->policy);
> + if (err < 0)
> + return err;
> + data = attr;
> + }
> + if (ops->validate) {
> + err = ops->validate(tb, data);
> + if (err < 0)
> + return err;
> + }
> + }
> +
> + if (dev) {
> + int modified = 0;
> +
> + if (nlh->nlmsg_flags & NLM_F_EXCL)
> + return -EEXIST;
> + if (nlh->nlmsg_flags & NLM_F_REPLACE)
> + return -EOPNOTSUPP;
> +
> + if (linkinfo[IFLA_INFO_DATA]) {
> + if (!ops || ops != dev->rtnl_link_ops ||
> + !ops->changelink)
> + return -EOPNOTSUPP;
> +
> + err = ops->changelink(dev, tb, data);
> + if (err < 0)
> + return err;
> + modified = 1;
> + }
> +
> + return do_setlink(dev, ifm, tb, ifname, modified);
> + }
> +
> + if (!(nlh->nlmsg_flags & NLM_F_CREATE))
> + return -ENODEV;
> +
> + if (ifm->ifi_index)
> + return -EINVAL;
> + if (tb[IFLA_ADDRESS] || tb[IFLA_BROADCAST] || tb[IFLA_MAP])
> + return -EOPNOTSUPP;
> +
> +#ifdef CONFIG_KMOD
> + if (!ops && name[0]) {
> + /* race condition: device may be created while rtnl is
> + * unlocked, final register_netdevice will catch it.
> + */
> + __rtnl_unlock();
> + request_module("rtnl-link-%s", name);
> + rtnl_lock();
> + ops = rtnl_link_ops_get(name);
> + }
> +#endif
> + if (!ops)
> + return -EOPNOTSUPP;
> +
> + if (!ifname[0])
> + snprintf(ifname, IFNAMSIZ, "%s%%d", ops->name);
> + dev = alloc_netdev(ops->priv_size, ifname, ops->setup);
> + if (!dev)
> + return -ENOMEM;
> +
> + if (strchr(dev->name, '%')) {
> + err = dev_alloc_name(dev, dev->name);
> + if (err < 0)
> + goto err_free;
> + }
> + dev->rtnl_link_ops = ops;
> +
> + if (tb[IFLA_MTU])
> + dev->mtu = nla_get_u32(tb[IFLA_MTU]);
> + if (tb[IFLA_TXQLEN])
> + dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
> + if (tb[IFLA_WEIGHT])
> + dev->weight = nla_get_u32(tb[IFLA_WEIGHT]);
> + if (tb[IFLA_OPERSTATE])
> + set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
> + if (tb[IFLA_LINKMODE])
> + dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
> +
> + err = ops->newlink(dev, tb, data);
> +err_free:
> + if (err < 0)
> + free_netdev(dev);
> + return err;
> + }
> +}
> +
Eric
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